builds for torch 2.7.0 (#2552)

* builds for torch==2.7.0

* use xformers==0.0.29.post3

* no vllm support with torch 2.7

* update default, fix conditional

* no xformers for 270

* no vllm on 2.7.0 for multigpu test too

* remove deprecated verbose arg from scheduler

* 2.7.0 tests on cpu

.github/workflows/multi-gpu-e2e.yml

@@ -45,6 +45,13 @@ jobs:
             axolotl_extras: vllm
             num_gpus: 2
             nightly_build: "true"
+          - cuda: 126
+            cuda_version: 12.6.3
+            python_version: "3.11"
+            pytorch: 2.7.0
+            axolotl_extras:
+            num_gpus: 2
+            nightly_build: "true"
     runs-on: [self-hosted, modal]
     timeout-minutes: 120
     steps: